CVE-2026-98078 Linux CVE debrief

Who should care

Defenders responsible for Linux kernel security, particularly those managing systems that utilize IPVS, should assess exposure and prioritize patching. This vulnerability could lead to information disclosure, making it essential for security teams to verify and apply patches.

Why it matters

CVE-2026-98078 is a vulnerability in the Linux kernel's IPVS implementation that could lead to information disclosure. Defenders managing Linux systems with IPVS enabled should verify exposure, prioritize patching, and review IPVS configurations.

• Potential disclosure of sensitive information
• Verification of IPVS implementation and configuration required
• Patching Linux kernel versions affected by this vulnerability

Technical summary

The Linux kernel's IPVS implementation has a vulnerability due to incorrect serialization of sequence options. The hton_seq() function expects the host-order source first and the unaligned network-order destination second, but the version 1 sync sender passes these arguments in reverse for both sequence blocks. This leaves 24 bytes of the kmalloc-backed message unwritten, potentially disclosing stale heap data and replacing the live connection sequence state with values read from the buffer.

Defensive priority

Defenders should prioritize verifying and applying patches for Linux kernel versions affected by this vulnerability, particularly in environments where IPVS is utilized.

Recommended defensive actions

• Verify and apply Linux kernel patches for IPVS sequence option serialization fix
• Review IPVS configurations and ensure proper implementation
• Monitor for potential information disclosure
• Perform vulnerability scanning to identify exposed systems
• Implement additional logging and monitoring for IPVS traffic
• Review system change management processes for patch deployment
• Track and document patching exceptions

Evidence notes

The CVE record and associated references indicate a vulnerability in the Linux kernel's IPVS implementation. However, specific details about affected versions, exploitation, or impact are limited in the provided corpus.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.